Note 5 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net (loss) income	$ (121,534)	$ 521,414	$ 2,592,177	$ 2,780,411
Numerator for basic and diluted earnings per share	$ (121,534)	$ 521,414	$ 2,592,177	$ 2,780,411
Denominator for basic EPS: weighted-average shares (in shares)	9,154,209	9,270,862	9,199,173	9,232,397
Effect of dilutive securities:
Effect of dilutive securities (in shares)	822	3,088	786	13,669
Denominator for diluted EPS-weighted-average shares (in shares)	9,155,031	9,273,950	9,199,959	9,246,066
Basic (loss) earnings per share (in dollars per share)	$ (0.01)	$ 0.06	$ 0.28	$ 0.30
Diluted (loss) earnings per share (in dollars per share)	$ (0.01)	$ 0.06	$ 0.28	$ 0.30
Employee Stock Option [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)				9,810
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	822	3,088	786	3,859

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